U0184 code meaning
Lost Communication With Radio
What U0184 means
U0184 is logged when the radio or infotainment head unit no longer answers on the bus; cluster, gateway, HVAC or amplifier store it, often several at once. GM bulletin 16-NA-115 (many 2014 GM models) reprograms the radio when it stays silent, shows a dark display or fails to wake up. Ford SSM 49695 (F-Super Duty 2020-2021) first rules out transport mode, then pulls fuse F32 in the BCM for five minutes before reseating the audio module connector. Stellantis case S2208000124 notes that the code can set when the radio wakes late on the audio CAN bus and to inspect the security gateway terminals before replacing anything. The Saab 9-5 list carries it too. Sound, display and phone functions fail; no MIL. U0186 is the amplifier.
U0184 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.2 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0184
- Radio dead, screen blank or no sound
- Phone, reversing camera or voice control not available
- U0184 stored in several modules
Common causes of U0184
- Most likelyRadio software hang or wake-up problem, fixed by reset or reprogramming (GM, Ford)
- PossibleSpread or pushed-out terminals at radio or security gateway (Stellantis)
- Less likelyVehicle still in transport mode (Ford)
- Less likelyRadio or head unit faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Radio moduleCAN bus wiring
What each part of U0184 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 84 | The exact fault in that area. |
What to do next
- Note U0184 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0184
What does U0184 mean?
U0184 means "Lost Communication With Radio". U0184 is logged when the radio or infotainment head unit no longer answers on the bus; cluster, gateway, HVAC or amplifier store it, often several at once. It is a generic code, so it means the same on every make.
Is it safe to drive with U0184?
U0184 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0184 fail an emissions test?
U0184 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0184 to fix?
Difficulty: medium. A typical repair takes 0.2 to 3 hours of work. This is a job for a workshop.
Will U0184 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.